Physical properties of sediment cores of the Bengal Fan

We examined geophysical data from a Multi-Sensor Core Logger (MSCL), a logging device providing continuous measurements of gamma-ray attenuation, p-wave travel time, and magnetic susceptibility on marine sediment cores. In the first part we focused on the gamma-ray system and compared two different...

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Bibliographic Details
Main Authors: Weber, Michael E, Niessen, Frank, Kuhn, Gerhard, Wiedicke-Hombach, Michael
Format: Dataset
Language:English
Published: PANGAEA 1997
Subjects:
Bay of Bengal
BENGAL FAN
Gravity corer (Kiel type)
Indian Ocean
KL
Piston corer (BGR type)
SFB261
SL
SO93/1
SO93/1_22KL
SO93/2
SO93/2_40KL
SO93/3
SO93/3_103KL
SO93/3_105KL
SO93/3_115KL
SO93/3_124KL
SO93/3_128SL
Sonne
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
Antarctic
Indian
The Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.738528
https://doi.org/10.1594/PANGAEA.738528
Description
Summary:We examined geophysical data from a Multi-Sensor Core Logger (MSCL), a logging device providing continuous measurements of gamma-ray attenuation, p-wave travel time, and magnetic susceptibility on marine sediment cores. In the first part we focused on the gamma-ray system and compared two different calibration methods. From the gamma-ray attenuation, we calculated densities and porosities by incorporating mass weighted attenuation coefficients. The application of an iteration method reduces the error of the density and porosity estimates compared to GRAPE data. In addition, we derived equations to calculate water content and dry bulk density from gamma-ray attenuation measurements. Comparison with physical properties determined on discrete samples revealed a very good correlation of both data sets (r = 0.99). This correlation is valid for sediments from substantially different geological settings (e.g., turbidites, hemipelagic muds, and opal-rich sediments). In the second part we applied our data to marine geological questions. For sediments from the Antarctic Polar Frontal Zone, there is indication that the content of biogenic opal can be assessed using a correlation of density and p-wave velocity. For sediments from the Bengal Fan, the relationship between the MSCL acoustic impedance (the product of density and p-wave velocity) and the grain-size distribution in discrete samples can be used to predict clay and sand/silt ratios for sediment cores from the shelf and upper continental slope.

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